Posted by **Jack** on Saturday, January 13, 2007 at 3:31pm.

A firm faces the following sales function:

Q=5,000-10P+40A+PA-0.8A^2-0.5P^2

where Q is sales, P is price(dollars), and A is advertising expenditures (in hundreds of dollars). Calculate the price and advertising levels that maximize sales.

I don't know what to do with it with three variables.

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